add rails footnotes
initial courses/course_meetings (sedarim/shiurim) implementation

initial migration and models

rough out controller and hard-coded view

implement active_link_to

basic info for sedarim, shiurim on sedarim page

fix Home active link

add basic CourseMeeting controller logic

add summary table to shiurim index

course meeting tables, routes

move course meeting resources into text blob

use slug for course route

add course_meetings controller with rudimentary embedding

fix embedded media

tweak formatting